On 5 July 1963 the Bulgarian Ministry of Internal Affairs completed an information report on NATO's activity during the Cuban Missile Crisis. In the report, the ministry outlines detailed espionage carried out by NATO agents. According to the report, the NATO Military Intelligence Services provided instructions for NATO member-states' military attaches stationed in Warsaw Pact countries and agents they could get to cooperate with them. Agents were to observe and report specific military intelligence collecting in Warsaw Pact countries -- arms deliveries, missile sites, military movements, etc. The report also includes explanation of how the attaches carried out their intelligence gathering -- reading official press, speaking in Russian and misrepresenting themselves as Russian, etc . The Bulgarian Interior Ministry notes that Western governments were well-informed of Bulgarian military structures -- including exact formations and secret designations.

A report on the investigation of a political conspiracy, said to be organized by Metodiy Chavdarov, a colonel at the Sliven garrison. The arrested colonel and his accomplices allegedly conspired to overthrow the Fatherland Front government, once the Soviet troops leave the country.

A memo to the head of the People’s ''Militsiya'' with information on the on-going purges in the Bulgarian military. Purportedly pro-fascist officers have established a broad network of conspirators committed to overthrowing the Fatherland Front government.

The Ministry of Internal Affairs reports its intelligence findings on the military cooperation between the US, Greece and Turkey.

The Ministry of Internal Affairs reports its intelligence findings on the activities of the Yugoslav intelligence services against Bulgaria. Working both from home and in-country, the Yugoslav intelligence is allegedly trying to gather information on a broad set of issues – ranging from trade relations within Comecon, to Bulgaria’s military capacity and its potential to pose a threat to Yugoslav Macedonia.